public class demo1 {
    private static int count;
    public static void main(String[] args) throws InterruptedException {
        Object object = new Object();
        Thread t1 = new Thread(()->{
            for (int i = 0 ;i<50000;i++){
                synchronized (object){
                    count++;
                }
            }
        });
        Thread t2 = new Thread(()->{
            for (int i = 0 ;i<50000;i++){
                synchronized (object){
                    count++;
                }
            }
        });
        t1.start();
        t2.start();
        t1.join();
        t2.join();
        System.out.println("count :" +count);
    }
}
